342 SPOROZOA. 



288. Myxobolus sp. 



■fMyxobolus sp., Southwell, 1915, pp. 312-13, pi. xxvi, fig. 3. 

 Myxobolus sp., Kudo, 1920, p. 151 ; 1933, p. 209. 



Cyst soft, flattened, roughly oval or lenticular, milky -white 

 in colour. Spore with two equal polar capsules, with a very 

 short anterior tail-Hke process. lodinophilous vacuole present. 



Dimensions. — Cysts up to 1-1 mm ; spores 13/x by 13/x ; 

 polar capsule 4^ hy 4 [jl. 



Habitat. — Subcutaneous intermuscular tissue of Rasbora 

 daniconius (Ham.-Buch.) from a stream near Katiwan : 

 United Provinces, Mirzapore. 



Genus THELOHANELLUS Kudo, 1933. 



Myxobolus (part), Biitschli, 1882, pi. xxxviii ; Labbe, 1899, pp. 97- 

 101 ; Kudo, 1920, p. 132 ; Wenyon, 1926, p. 727 ; Reichenow, 

 1929, pp. 1068-72; Kudo, 1931, p. 312; Calkins, 1933, p. 568. 



Thelohanelhis, Kudo, 1933, pp. 198, 210. 



Spore pyriform ; flattened. One polar capsule at the 

 anterior end. Sporoplasm with an lodinophilous vacuole. 

 Histozoic in freshwater Fish. 



Key to Indian Species. 



1 (2). Cyst oval to cylindrical ; spore 30-32 /x [Prashad), p. 342. 



by 7-8 |u, T. rohitse (Southwell & 



2(1). Cyst elongated, ellipsoidal; spore [Prashad), p. 344. 



13-2-13-6jLt by 10-1-10-3/i T. seni (Southwell & 



289. Thelohanellus rohitae (Southwell & Prashad). (Fig. 169.) 



^Myxobolus rohitae, Southwell & Prashad, 1918, pp. 344-7, pi. xi, 

 figs. 1-27. 

 Thelohanellus rohitse. Kudo, 1920, p. 132 ; 1933, p. 210. 



Cysts oval to cylindrical, with the long axis of the cyst 

 parallel to the gill -filaments, creamy-yellow in colour. The 

 wall of the cyst is formed of a vertically striated portion 

 showing no nuclei, covered externally by a membrane, two 

 to three layers thick, and lined internally by an endoplasmic 

 layer showing a coarse granular structure and with scattered 

 nuclei. In the endoplasm two kinds of nuclei are found, 

 viz., the vegetative and the generative. The latter occur 

 in rounded cells called pansporoblasts or propagative cells. 

 They are rounded in shape, with a marginally situated nucleus, 

 and vary in size from 6 to 11 fi. The nucleus in the pan- 

 sporoblast divides mitotically. Finally ten fully formed 

 nuclei can be distinguished in the mother-pansporo blast, 

 besides two nuclei for the pansporoblast mother-cell, and 



